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plt.c
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plt.c
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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <time.h>
#include <math.h>
#include <string.h>
void
pbmgrid(char **grid, int w, int h, FILE* f)
{
int x, y;
if (f == NULL)
f = stdout;
fprintf(f, "P1\n");
fprintf(f, "%d %d\n", w, h);
/* foreach row */
for (y = 0; y < h; y++) {
/* foreach cell */
for (x = 0; x < w; x++) {
if (grid[x][y] == 1)
fputc('0', f);
else
fputc('1', f);
if (x != (w-1))
fputc(' ', f);
}
fputc('\n', f);
}
}
void
randgrid(char **grid, int w, int h)
{
int x, y;
/* foreach row */
for(y = 0; y < h; y++) {
/* foreach cell */
for(x = 0; x < w; x++) {
grid[x][y] = rand() % 2 == 1;
}
}
}
char **
allocf(int width, int height)
{
char **f;
int i;
f = calloc(sizeof(char *), width);
for (i = 0; i < width; i++)
f[i] = calloc(sizeof(char), height);
return f;
}
void
clearf(char **field, int width, int height)
{
int x, y;
for (x = 0; x < width; x++) {
for (y = 0; y < height; y++) {
field[x][y] = 0;
}
}
}
void
freef(char **field, int width) {
int i;
for (i = 0; i < width; i++)
free(field[i]);
free(field);
}
void
draw_sin(char **grid, int w, int h, double scale, double offset)
{
int x;
int y = 0;
double v;
for (x = 0; (x < w) && y < h; x++) {
v = sin((double)x/scale + offset);
y = (int)(v * scale) + 4*scale;
if (y < h)
grid[x][y] = 1;
}
}
void
draw_cos(char **grid, int w, int h, double scale, double offset)
{
int x;
int y = 0;
double v;
for (x = 0; (x < w) && y < h; x++) {
v = cos((double)x/scale + offset);
y = (int)(v * scale) + 4*scale;
if (y < h)
grid[x][y] = 1;
}
}
void
draw_tan(char **grid, int w, int h, double scale, double offset)
{
int x;
int y = 0;
double v;
for (x = 0; (x < w) && y < h; x++) {
v = tan((double)x/scale + offset);
y = (int)(v * scale) + 4*scale;
if (y < h && x < w && y >= 0 && x >= 0)
grid[x][y] = 1;
}
}
int
main(void) {
int width = 2560;
int height = 1440;
int i;
int frames = 200;
char fpath[100];
char **grid;
/* init */
grid = allocf(width, height);
double scale = 50.0;
double offset = 1.0;
double offset2 = 1.0;
double offset3 = 1.0;
double offset4 = 1.0;
for (i = 0; i < frames; i++) {
snprintf(fpath, 100, "plt_pbm_%05d.pbm", i);
FILE *pbmf = fopen(fpath, "w");
clearf(grid, width, height);
draw_sin(grid, width, height, scale, offset);
draw_cos(grid, width, height, scale, offset2);
draw_sin(grid, width, height, scale, offset3);
draw_cos(grid, width, height, scale, offset4);
offset += 0.09;
offset2 += 0.11;
offset3 += 0.13;
offset4 += 0.16;
pbmgrid(grid, width, height, pbmf);
fclose(pbmf);
fprintf(stderr, "i: %d\n", i);
}
/* clean up */
freef(grid, width);
return 0;
}